Check GraphicsLayer::HasPaintState() when updating non-fast scrollable regions

This is similar to what we do in local_frame_view.cc when traversing
GraphicsLayers. The null paint state may be caused by throttling or
display lock.

Will follow up with a more complete solution.

Bug: 1110232
Change-Id: Idce2c3e2ff80932dd6d0b68db52fa33e2fb8973c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341251
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795562}

third_party/blink/renderer/core/page/scrolling/scrolling_coordinator.cc

@@ -167,7 +167,7 @@ static void ForAllPaintingGraphicsLayers(GraphicsLayer& layer,
     return;
   }
 
-  if (layer.PaintsContentOrHitTest())
+  if (layer.PaintsContentOrHitTest() && layer.HasLayerState())
     function(layer);
 
   for (auto* child : layer.Children())